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Erschienen in: Clinical Reviews in Allergy & Immunology 1/2009

01.02.2009

Inflammatory Pathways in Liver Homeostasis and Liver Injury

verfasst von: Frank Tacke, Tom Luedde, Christian Trautwein

Erschienen in: Clinical Reviews in Allergy & Immunology | Ausgabe 1/2009

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Abstract

The liver is a unique organ with respect to its anatomical location, allowing continuous blood flow from the gastrointestinal tract through the sinusoids, and its cellular composition, comprising metabolically active hepatocytes, nonhepatocytic parenchymal cells, and various immune cell populations. Cytokines are key mediators within the complex interplay of intrahepatic immune cells and hepatocytes, as they can activate effector functions of immune cells, as well as hepatocytic intracellular signaling pathways controlling cellular homeostasis. Kupffer cells and liver-infiltrating monocyte-derived macrophages are primary sources of cytokines such as tumor-necrosis factor-alpha (TNF-alpha) and interleukin-6. The liver is also enriched in natural killer (NK) and NK T cells, which fulfill functions in pathogen defense, T cell recruitment, and modulation of liver injury. TNF-alpha can activate specific intracellular pathways in hepatocytes that influence cell fate in different manners, e.g., proapoptotic signals via the caspase cascade, but also survival pathways, namely the nuclear factor (NF)-kappaB pathway. NF-kappaB regulates important functions in liver physiology and pathology. Recent experiments with genetically modified mice demonstrated important and partly controversial functions of this pathway, e.g., in cytokine-mediated hepatocyte apoptosis or ischemia–reperfusion injury. The exact dissection of the contribution of recruited and resident immune cells, their soluble cytokine and chemokine mediators, and the intracellular hepatocytic response in liver homeostasis and injury could potentially identify novel targets for the treatment of acute and chronic liver disease, liver fibrosis, or cirrhosis.
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Metadaten
Titel
Inflammatory Pathways in Liver Homeostasis and Liver Injury
verfasst von
Frank Tacke
Tom Luedde
Christian Trautwein
Publikationsdatum
01.02.2009
Verlag
Humana Press Inc
Erschienen in
Clinical Reviews in Allergy & Immunology / Ausgabe 1/2009
Print ISSN: 1080-0549
Elektronische ISSN: 1559-0267
DOI
https://doi.org/10.1007/s12016-008-8091-0

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